Rubber cement



HENRY A. CLARK, OF BOSTON, MASSACHUSETTS.

RUBBER CEMENT.

SPECIFICATION forming part of Letters Patent No. 389,056, dated September 4, 1888.

Application filed April 3, 1888, Serial No. 259.485.

.To aZZ whom it may concern.-

Be it known that I, HENRY A. CLARK, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements iii-Cement, of which the following is a full, clear, and exact description.

This invention relates to a cement more particularly intended for use in securing the outer sole to the innersole of a boot or shoe to hold the outersole in position on the inner sole durin g the process of securing the outer sole to the upper and inner sole by the stitches or pegs,&c. and the invention consists of a cement composed of the following ingredients in or about the proportions herein stated, all substantially as hereinafter fully described.

In the manufacture of this cement dissolve five (5) ounces of balata in one'quarter (l) of a gallon of naphtha, and also dissolve five (5) ounces of gutta-percha in one-quarter (l) of a gallon of naphtha, and also dissolve one and one-half (ll) ounces of india-rubbcr in onehalf (l) a gallon of naphtha, and when each of the above are thoroughly dissolved mix the whole thoroughly together and add to the mixture thirteen (13) ounces of resin or pitch, and thoroughly mix the whole together.

It is preferable to dissolve the balata, guttapercha, and indie-rubber under heat; also, if desired, they can all be dissolved in the naphtha together, or, before dissolving, they can be mechanically mixed together; also, if desired, the resin or pitch can be addedin a dry state, or they can be dissolved in naphtha or benzine and added in a liquid form; also, it is preferable to dissolve and mix all the ingredients together in a warm condition.

\Vhen the compound is cold it is ready for use, and in the nmnut'actureol' boots and shoes each outer sole is coated with the cement when cold on the side which will be next to the inner sole with a brush or with any suit able implement and in any desirable manner, and when the cement is dry, which will be in afew minutes, the soles so coated can be packed away ready for use.

When the boot or shoe upper is lasted to the inner sole, the outer sole so cemented is placed over any suitable healer until the cein (No specimens.)

cut is sufficiently warm to become tacky ready to be secured to the upper and inner L sole in the usual manner.

Theindia-rubber prevents the balata or gotta-percha from becoming so solid as to require heat when applying it to the sole. The balata enables the cement to be laid on the article to be cemented much smoother and more evenly than if made of either india-rubber or guttapercha, alone or together, without the balata. It also prevents cracking of the cement when drying, and in the use ofthe cementhaving the balata as one of the elements its greater adhesive qualities yield results that are thoroughly practical and satisfactory, and such as either the india-rubber or gutta-percha, alone or together, without the balata will not produce, and the resin orpitch makes thecementwhen warmed after being applied to the sole more tacky or sticky, so that it will adhere quickly to the inner sole.

This cement is of the consistency of flourpastc, and can be applied with a brush or any suitable implement; also, the cement when applied to the boot or shoe sole does not require to be warmed, as it can be applied when cold, which is advantageous over cements now used for such purposes, which have to be heated before applying, which generates more or less gas from the naphtha, incurring risk of fire, &-c., in their use, while the use of the present cement being applied cold obviates all such risks.

Although the cement is particularly herein stated as designed for use on boots and shoes, obviously it can be used for any purpose where a cement is desired to secure any materials together.

Anysuitableresi nous or pitch y substance can be used in place of the resin or pitch, but resin is preferable, or it can be dispensed with, but it is preferable to use it; also, the proportions of the several materials composing this cement can be varied more or less. For instance, a less amount of balala than the gutta-percha,

or vice versa, or any suitable proportions of the two, and all can be mixed together in any suitable manner without departing from this invention; but substantially as herein de- 5 scribed is satisfactory and produces good results in practical operation.

Having thus described my invention,what I I claim is 1. A cement composed of balata, india-rub- 10 her, gutta-percha, and naphtha, in or about the proportions stated.

2. A cement composed of balata, india-rubber, gutta-percha, naphtha, and a resinous 0r pitchy substance, in or about the proportions stated. r 5

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

HENRY A. CLARK.

W'itnesses:

EDWIN W. BROWN, 0. E. NIGHoLs. 

